Document Type

Thesis - Open Access

Award Date

2019

Degree Name

Master of Science (MS)

Department / School

Civil and Environmental Engineering

First Advisor

Mostafa Tazarv

Abstract

Current seismic design codes ensure life safety for buildings, but structural members may significantly yield or even fail under strong earthquakes. A new design approach is to implement connections that localize the yielding and failure to fuses. A more sophisticated approach is to be able to replace the fuses after the event. The present study was carried out to develop repairable moment-resisting (MR) connections for steel buildings and to investigate their seismic performance through nonlinear finite element analyses (FEA). Two details were proposed using buckling restrained fuses (BRFs) and buckling restrained reinforcement (BRR). Test data was collected from the literature on buckling restrained braces (BRBs) and a conventional steel MR joint, and FE modeling methods were proposed and validated against the test data. Subsequently, FE models were developed for the repairable joints using the validated models. For the repairable alternatives using BRFs, it was found that the displacement capacity was twice of that for the conventional joint. However, the initial stiffness of the BRF repairable joints was 34-44% lower than that for the conventional MR joint. A similar trend was observed for the BRR alternatives. Overall, this pilot analytical study confirmed that both of the proposed repairable details are viable with improved seismic performance. Furthermore, these joints can be quickly repaired after strong earthquakes by replacement BRF or BRR thus the steel building total replacement is prevented.

Library of Congress Subject Headings

Earthquake resistant design.
Building, Iron and steel -- Earthquake effects.
Buildings -- Earthquake effects.
Steel framing (Building)
Buildings -- Joints.
Buildings -- Repair and reconstruction.

Format

application/pdf

Number of Pages

140

Publisher

South Dakota State University

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Rights Statement

In Copyright